Merge remote-tracking branch 's5p/for-next'
[linux-2.6/next.git] / drivers / scsi / isci / remote_node_table.c
blob301b3141945ec26799d254d02d75daaf22556a07
1 /*
2 * This file is provided under a dual BSD/GPLv2 license. When using or
3 * redistributing this file, you may do so under either license.
5 * GPL LICENSE SUMMARY
7 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of version 2 of the GNU General Public License as
11 * published by the Free Software Foundation.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
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19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
21 * The full GNU General Public License is included in this distribution
22 * in the file called LICENSE.GPL.
24 * BSD LICENSE
26 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
27 * All rights reserved.
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30 * modification, are permitted provided that the following conditions
31 * are met:
33 * * Redistributions of source code must retain the above copyright
34 * notice, this list of conditions and the following disclaimer.
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37 * the documentation and/or other materials provided with the
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41 * from this software without specific prior written permission.
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53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
56 /**
57 * This file contains the implementation of the SCIC_SDS_REMOTE_NODE_TABLE
58 * public, protected, and private methods.
62 #include "remote_node_table.h"
63 #include "remote_node_context.h"
65 /**
67 * @remote_node_table: This is the remote node index table from which the
68 * selection will be made.
69 * @group_table_index: This is the index to the group table from which to
70 * search for an available selection.
72 * This routine will find the bit position in absolute bit terms of the next 32
73 * + bit position. If there are available bits in the first u32 then it is
74 * just bit position. u32 This is the absolute bit position for an available
75 * group.
77 static u32 sci_remote_node_table_get_group_index(
78 struct sci_remote_node_table *remote_node_table,
79 u32 group_table_index)
81 u32 dword_index;
82 u32 *group_table;
83 u32 bit_index;
85 group_table = remote_node_table->remote_node_groups[group_table_index];
87 for (dword_index = 0; dword_index < remote_node_table->group_array_size; dword_index++) {
88 if (group_table[dword_index] != 0) {
89 for (bit_index = 0; bit_index < 32; bit_index++) {
90 if ((group_table[dword_index] & (1 << bit_index)) != 0) {
91 return (dword_index * 32) + bit_index;
97 return SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX;
102 * @out]: remote_node_table This the remote node table in which to clear the
103 * selector.
104 * @set_index: This is the remote node selector in which the change will be
105 * made.
106 * @group_index: This is the bit index in the table to be modified.
108 * This method will clear the group index entry in the specified group index
109 * table. none
111 static void sci_remote_node_table_clear_group_index(
112 struct sci_remote_node_table *remote_node_table,
113 u32 group_table_index,
114 u32 group_index)
116 u32 dword_index;
117 u32 bit_index;
118 u32 *group_table;
120 BUG_ON(group_table_index >= SCU_STP_REMOTE_NODE_COUNT);
121 BUG_ON(group_index >= (u32)(remote_node_table->group_array_size * 32));
123 dword_index = group_index / 32;
124 bit_index = group_index % 32;
125 group_table = remote_node_table->remote_node_groups[group_table_index];
127 group_table[dword_index] = group_table[dword_index] & ~(1 << bit_index);
132 * @out]: remote_node_table This the remote node table in which to set the
133 * selector.
134 * @group_table_index: This is the remote node selector in which the change
135 * will be made.
136 * @group_index: This is the bit position in the table to be modified.
138 * This method will set the group index bit entry in the specified gropu index
139 * table. none
141 static void sci_remote_node_table_set_group_index(
142 struct sci_remote_node_table *remote_node_table,
143 u32 group_table_index,
144 u32 group_index)
146 u32 dword_index;
147 u32 bit_index;
148 u32 *group_table;
150 BUG_ON(group_table_index >= SCU_STP_REMOTE_NODE_COUNT);
151 BUG_ON(group_index >= (u32)(remote_node_table->group_array_size * 32));
153 dword_index = group_index / 32;
154 bit_index = group_index % 32;
155 group_table = remote_node_table->remote_node_groups[group_table_index];
157 group_table[dword_index] = group_table[dword_index] | (1 << bit_index);
162 * @out]: remote_node_table This is the remote node table in which to modify
163 * the remote node availability.
164 * @remote_node_index: This is the remote node index that is being returned to
165 * the table.
167 * This method will set the remote to available in the remote node allocation
168 * table. none
170 static void sci_remote_node_table_set_node_index(
171 struct sci_remote_node_table *remote_node_table,
172 u32 remote_node_index)
174 u32 dword_location;
175 u32 dword_remainder;
176 u32 slot_normalized;
177 u32 slot_position;
179 BUG_ON(
180 (remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
181 <= (remote_node_index / SCU_STP_REMOTE_NODE_COUNT)
184 dword_location = remote_node_index / SCIC_SDS_REMOTE_NODES_PER_DWORD;
185 dword_remainder = remote_node_index % SCIC_SDS_REMOTE_NODES_PER_DWORD;
186 slot_normalized = (dword_remainder / SCU_STP_REMOTE_NODE_COUNT) * sizeof(u32);
187 slot_position = remote_node_index % SCU_STP_REMOTE_NODE_COUNT;
189 remote_node_table->available_remote_nodes[dword_location] |=
190 1 << (slot_normalized + slot_position);
195 * @out]: remote_node_table This is the remote node table from which to clear
196 * the available remote node bit.
197 * @remote_node_index: This is the remote node index which is to be cleared
198 * from the table.
200 * This method clears the remote node index from the table of available remote
201 * nodes. none
203 static void sci_remote_node_table_clear_node_index(
204 struct sci_remote_node_table *remote_node_table,
205 u32 remote_node_index)
207 u32 dword_location;
208 u32 dword_remainder;
209 u32 slot_position;
210 u32 slot_normalized;
212 BUG_ON(
213 (remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
214 <= (remote_node_index / SCU_STP_REMOTE_NODE_COUNT)
217 dword_location = remote_node_index / SCIC_SDS_REMOTE_NODES_PER_DWORD;
218 dword_remainder = remote_node_index % SCIC_SDS_REMOTE_NODES_PER_DWORD;
219 slot_normalized = (dword_remainder / SCU_STP_REMOTE_NODE_COUNT) * sizeof(u32);
220 slot_position = remote_node_index % SCU_STP_REMOTE_NODE_COUNT;
222 remote_node_table->available_remote_nodes[dword_location] &=
223 ~(1 << (slot_normalized + slot_position));
228 * @out]: remote_node_table The remote node table from which the slot will be
229 * cleared.
230 * @group_index: The index for the slot that is to be cleared.
232 * This method clears the entire table slot at the specified slot index. none
234 static void sci_remote_node_table_clear_group(
235 struct sci_remote_node_table *remote_node_table,
236 u32 group_index)
238 u32 dword_location;
239 u32 dword_remainder;
240 u32 dword_value;
242 BUG_ON(
243 (remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
244 <= (group_index / SCU_STP_REMOTE_NODE_COUNT)
247 dword_location = group_index / SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
248 dword_remainder = group_index % SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
250 dword_value = remote_node_table->available_remote_nodes[dword_location];
251 dword_value &= ~(SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE << (dword_remainder * 4));
252 remote_node_table->available_remote_nodes[dword_location] = dword_value;
257 * @remote_node_table:
259 * THis method sets an entire remote node group in the remote node table.
261 static void sci_remote_node_table_set_group(
262 struct sci_remote_node_table *remote_node_table,
263 u32 group_index)
265 u32 dword_location;
266 u32 dword_remainder;
267 u32 dword_value;
269 BUG_ON(
270 (remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
271 <= (group_index / SCU_STP_REMOTE_NODE_COUNT)
274 dword_location = group_index / SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
275 dword_remainder = group_index % SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
277 dword_value = remote_node_table->available_remote_nodes[dword_location];
278 dword_value |= (SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE << (dword_remainder * 4));
279 remote_node_table->available_remote_nodes[dword_location] = dword_value;
284 * @remote_node_table: This is the remote node table that for which the group
285 * value is to be returned.
286 * @group_index: This is the group index to use to find the group value.
288 * This method will return the group value for the specified group index. The
289 * bit values at the specified remote node group index.
291 static u8 sci_remote_node_table_get_group_value(
292 struct sci_remote_node_table *remote_node_table,
293 u32 group_index)
295 u32 dword_location;
296 u32 dword_remainder;
297 u32 dword_value;
299 dword_location = group_index / SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
300 dword_remainder = group_index % SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
302 dword_value = remote_node_table->available_remote_nodes[dword_location];
303 dword_value &= (SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE << (dword_remainder * 4));
304 dword_value = dword_value >> (dword_remainder * 4);
306 return (u8)dword_value;
311 * @out]: remote_node_table The remote that which is to be initialized.
312 * @remote_node_entries: The number of entries to put in the table.
314 * This method will initialize the remote node table for use. none
316 void sci_remote_node_table_initialize(
317 struct sci_remote_node_table *remote_node_table,
318 u32 remote_node_entries)
320 u32 index;
323 * Initialize the raw data we could improve the speed by only initializing
324 * those entries that we are actually going to be used */
325 memset(
326 remote_node_table->available_remote_nodes,
327 0x00,
328 sizeof(remote_node_table->available_remote_nodes)
331 memset(
332 remote_node_table->remote_node_groups,
333 0x00,
334 sizeof(remote_node_table->remote_node_groups)
337 /* Initialize the available remote node sets */
338 remote_node_table->available_nodes_array_size = (u16)
339 (remote_node_entries / SCIC_SDS_REMOTE_NODES_PER_DWORD)
340 + ((remote_node_entries % SCIC_SDS_REMOTE_NODES_PER_DWORD) != 0);
343 /* Initialize each full DWORD to a FULL SET of remote nodes */
344 for (index = 0; index < remote_node_entries; index++) {
345 sci_remote_node_table_set_node_index(remote_node_table, index);
348 remote_node_table->group_array_size = (u16)
349 (remote_node_entries / (SCU_STP_REMOTE_NODE_COUNT * 32))
350 + ((remote_node_entries % (SCU_STP_REMOTE_NODE_COUNT * 32)) != 0);
352 for (index = 0; index < (remote_node_entries / SCU_STP_REMOTE_NODE_COUNT); index++) {
354 * These are all guaranteed to be full slot values so fill them in the
355 * available sets of 3 remote nodes */
356 sci_remote_node_table_set_group_index(remote_node_table, 2, index);
359 /* Now fill in any remainders that we may find */
360 if ((remote_node_entries % SCU_STP_REMOTE_NODE_COUNT) == 2) {
361 sci_remote_node_table_set_group_index(remote_node_table, 1, index);
362 } else if ((remote_node_entries % SCU_STP_REMOTE_NODE_COUNT) == 1) {
363 sci_remote_node_table_set_group_index(remote_node_table, 0, index);
369 * @out]: remote_node_table The remote node table from which to allocate a
370 * remote node.
371 * @table_index: The group index that is to be used for the search.
373 * This method will allocate a single RNi from the remote node table. The
374 * table index will determine from which remote node group table to search.
375 * This search may fail and another group node table can be specified. The
376 * function is designed to allow a serach of the available single remote node
377 * group up to the triple remote node group. If an entry is found in the
378 * specified table the remote node is removed and the remote node groups are
379 * updated. The RNi value or an invalid remote node context if an RNi can not
380 * be found.
382 static u16 sci_remote_node_table_allocate_single_remote_node(
383 struct sci_remote_node_table *remote_node_table,
384 u32 group_table_index)
386 u8 index;
387 u8 group_value;
388 u32 group_index;
389 u16 remote_node_index = SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX;
391 group_index = sci_remote_node_table_get_group_index(
392 remote_node_table, group_table_index);
394 /* We could not find an available slot in the table selector 0 */
395 if (group_index != SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX) {
396 group_value = sci_remote_node_table_get_group_value(
397 remote_node_table, group_index);
399 for (index = 0; index < SCU_STP_REMOTE_NODE_COUNT; index++) {
400 if (((1 << index) & group_value) != 0) {
401 /* We have selected a bit now clear it */
402 remote_node_index = (u16)(group_index * SCU_STP_REMOTE_NODE_COUNT
403 + index);
405 sci_remote_node_table_clear_group_index(
406 remote_node_table, group_table_index, group_index
409 sci_remote_node_table_clear_node_index(
410 remote_node_table, remote_node_index
413 if (group_table_index > 0) {
414 sci_remote_node_table_set_group_index(
415 remote_node_table, group_table_index - 1, group_index
419 break;
424 return remote_node_index;
429 * @remote_node_table: This is the remote node table from which to allocate the
430 * remote node entries.
431 * @group_table_index: THis is the group table index which must equal two (2)
432 * for this operation.
434 * This method will allocate three consecutive remote node context entries. If
435 * there are no remaining triple entries the function will return a failure.
436 * The remote node index that represents three consecutive remote node entries
437 * or an invalid remote node context if none can be found.
439 static u16 sci_remote_node_table_allocate_triple_remote_node(
440 struct sci_remote_node_table *remote_node_table,
441 u32 group_table_index)
443 u32 group_index;
444 u16 remote_node_index = SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX;
446 group_index = sci_remote_node_table_get_group_index(
447 remote_node_table, group_table_index);
449 if (group_index != SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX) {
450 remote_node_index = (u16)group_index * SCU_STP_REMOTE_NODE_COUNT;
452 sci_remote_node_table_clear_group_index(
453 remote_node_table, group_table_index, group_index
456 sci_remote_node_table_clear_group(
457 remote_node_table, group_index
461 return remote_node_index;
466 * @remote_node_table: This is the remote node table from which the remote node
467 * allocation is to take place.
468 * @remote_node_count: This is ther remote node count which is one of
469 * SCU_SSP_REMOTE_NODE_COUNT(1) or SCU_STP_REMOTE_NODE_COUNT(3).
471 * This method will allocate a remote node that mataches the remote node count
472 * specified by the caller. Valid values for remote node count is
473 * SCU_SSP_REMOTE_NODE_COUNT(1) or SCU_STP_REMOTE_NODE_COUNT(3). u16 This is
474 * the remote node index that is returned or an invalid remote node context.
476 u16 sci_remote_node_table_allocate_remote_node(
477 struct sci_remote_node_table *remote_node_table,
478 u32 remote_node_count)
480 u16 remote_node_index = SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX;
482 if (remote_node_count == SCU_SSP_REMOTE_NODE_COUNT) {
483 remote_node_index =
484 sci_remote_node_table_allocate_single_remote_node(
485 remote_node_table, 0);
487 if (remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX) {
488 remote_node_index =
489 sci_remote_node_table_allocate_single_remote_node(
490 remote_node_table, 1);
493 if (remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX) {
494 remote_node_index =
495 sci_remote_node_table_allocate_single_remote_node(
496 remote_node_table, 2);
498 } else if (remote_node_count == SCU_STP_REMOTE_NODE_COUNT) {
499 remote_node_index =
500 sci_remote_node_table_allocate_triple_remote_node(
501 remote_node_table, 2);
504 return remote_node_index;
509 * @remote_node_table:
511 * This method will free a single remote node index back to the remote node
512 * table. This routine will update the remote node groups
514 static void sci_remote_node_table_release_single_remote_node(
515 struct sci_remote_node_table *remote_node_table,
516 u16 remote_node_index)
518 u32 group_index;
519 u8 group_value;
521 group_index = remote_node_index / SCU_STP_REMOTE_NODE_COUNT;
523 group_value = sci_remote_node_table_get_group_value(remote_node_table, group_index);
526 * Assert that we are not trying to add an entry to a slot that is already
527 * full. */
528 BUG_ON(group_value == SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE);
530 if (group_value == 0x00) {
532 * There are no entries in this slot so it must be added to the single
533 * slot table. */
534 sci_remote_node_table_set_group_index(remote_node_table, 0, group_index);
535 } else if ((group_value & (group_value - 1)) == 0) {
537 * There is only one entry in this slot so it must be moved from the
538 * single slot table to the dual slot table */
539 sci_remote_node_table_clear_group_index(remote_node_table, 0, group_index);
540 sci_remote_node_table_set_group_index(remote_node_table, 1, group_index);
541 } else {
543 * There are two entries in the slot so it must be moved from the dual
544 * slot table to the tripple slot table. */
545 sci_remote_node_table_clear_group_index(remote_node_table, 1, group_index);
546 sci_remote_node_table_set_group_index(remote_node_table, 2, group_index);
549 sci_remote_node_table_set_node_index(remote_node_table, remote_node_index);
554 * @remote_node_table: This is the remote node table to which the remote node
555 * index is to be freed.
557 * This method will release a group of three consecutive remote nodes back to
558 * the free remote nodes.
560 static void sci_remote_node_table_release_triple_remote_node(
561 struct sci_remote_node_table *remote_node_table,
562 u16 remote_node_index)
564 u32 group_index;
566 group_index = remote_node_index / SCU_STP_REMOTE_NODE_COUNT;
568 sci_remote_node_table_set_group_index(
569 remote_node_table, 2, group_index
572 sci_remote_node_table_set_group(remote_node_table, group_index);
577 * @remote_node_table: The remote node table to which the remote node index is
578 * to be freed.
579 * @remote_node_count: This is the count of consecutive remote nodes that are
580 * to be freed.
582 * This method will release the remote node index back into the remote node
583 * table free pool.
585 void sci_remote_node_table_release_remote_node_index(
586 struct sci_remote_node_table *remote_node_table,
587 u32 remote_node_count,
588 u16 remote_node_index)
590 if (remote_node_count == SCU_SSP_REMOTE_NODE_COUNT) {
591 sci_remote_node_table_release_single_remote_node(
592 remote_node_table, remote_node_index);
593 } else if (remote_node_count == SCU_STP_REMOTE_NODE_COUNT) {
594 sci_remote_node_table_release_triple_remote_node(
595 remote_node_table, remote_node_index);